SELECTION OF PARENTS FOR HYBRIDIZATION IN MUSTARD (Brassica sp.)

Abstract

An experiment was conducted with 22 genotypes of mustard ( Brassica sp.) at the experimental field under the Department of Genetics and Plant Breeding, Hajee Mohammad Danesh Science and Technology University, Dinajpur to study the nature and magnitude of heritability, variability and genetic diversity of 22 mustard ( Brassica sp.) genotypes during the period from November 2010 to March 2011. Data were recorded on plant height, days to maturity, days to 50% flowering, number of primary branches per plant, number of secondary branches per plant, number of siliqua per plant, length of siliqua, diameter of siliqua, number of seed per siliqua, 1000 seed weight and yield per plant. A remarkable variation in plant characters and yield performance was noticed among the genotypes. The magnitudes of phenotypic co-efficient of variation were higher than corresponding genetic co-efficient of variation. Higher genotypic as well as phenotypic co-efficient of variation were observed for number of secondary branches per plant, number of siliqua per plant, yield per plant. Heritability estimates were higher for plant height, number of siliqua per plant, 1000 seed weight and yield per plant. High heritability coupled with high magnitude of genetic advance in percent of mean was estimated for number of secondary branches per plant, number of silqua per plant, yield per plant. Based on D’ analysis, the genotypes were grouped into five different clusters, were the each cluster I, II], IV possessed one genotype. Cluster II possessed the maximum number of genotypes (12) followed by cluster V (7). The maximum in the cluster distance was observed between I and IV (D=5.1913). The lowest inter cluster distance was found I and V (D=2.4289). Intra cluster distance was the highest in V (D=0.7785). Considering cluster mean BARI-9 from cluster III for yield per plant and number of siliqua per plant, the genotype, SS-75 for number of seed siliqua and 1000 seed weight from cluster I and DAULAT for number siliqua per plant might be considered for hybridization program.